Touch ID recognition problems

Question

I've been using Touch ID for over a week. I'm trying to figure out why it isn't working.
The problem is that after I "enroll" my fingers (thumbs and index fingers), it works for maybe 5 or 10 minutes. After that, the sensor becomes extremely flaky and starts to fail to recognize any of the enrolled fingers.
According to my best estimates, the phone only unlocks about 5% of the time. The rest of the time, it just says "try again" and forces me to eventually enter a passcode. I wipe off the sensor, dry my fingers, wash my hands to remove oils, etc. to no avail. A few times, it worked consistently (1 or 2 touches to unlock) for about an hour at a time before it became inaccurate again.
I've tried removing and re-enrolling my fingers, but the same thing happens. I've heard a lot of stories about people using it and finding that it works relatively well, so I'm stumped on why it isn't working for my fingers. I called Apple and they didn't know enough to figure out why the sensor isn't working properly. My best guess had to do with temperature variations, but recent testing has ruled that out (I enrolled after washing and drying my hands, waited a half an hour, washed and dried my hands again, and it failed to unlock, all while being in a temperature-controlled room).
If anyone else has had this poor performance and been able to determine the cause, I'd like to know. Please don't just post that "it works for you" unless you have some useful information.
Thanks.

Answer 1

I also had the touch ID recognition problem come up after the last update.  I did find that scrubbing the screen with the same finger used to access your phone may help motivate the sensor and actually works more often for me then not.  Try scrubbing the screen before placing the recognized finger on the sensor.  See if that works for you...